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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df304c3e77cda9809ed3f9bb1dd3a716079566db6a140d6911c9ff7f30fcb15' 
  AND token = 'KxQiDmpQhhBIirt5EUhSTLc0b3y1Q9p2HWqlfTfrbbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}